46 C.F.R. § 111.01-13
Limitations on porcelain use.
Cite as 46 C.F.R. § 111.01-13 (2026)
Porcelain must not be used for lamp sockets, switches, receptacles, fuse blocks, or other electric equipment where the item is solidly mounted by machine screws or their equivalent, unless the porcelain piece is resiliently mounted.